KR20170012466A - Apparatus and method for producing and playing back a copy-protected wave field synthesis audio rendition - Google Patents

Abstract

The embodiment provides an apparatus for generating a copy-protected far field composite audio representation of an audio scene having a plurality of audio objects, each audio object including an audio file and location information. The apparatus includes a watermark embedder for embedding a watermark in at least one audio file of a plurality of audio objects to generate a modified audio file for at least one audio object, Specify. Additionally, the apparatus includes a far field synthesis processor for generating a copy protected, far field synthesized audio representation of the audio scene by using the speaker configuration of the particular playback room of the modified audio file and the location for the at least one audio object .

Description

[0001] APPARATUS AND METHOD FOR PRODUCING AND PLAYING A COPY-PROTECTED WAVE FIELD SYNTHESIS AUDIO RENDITION [0002]

Embodiments of the present invention are directed to an apparatus for generating a copy protected far field composite audio representation of an audio scene, as well as associated methods and apparatus and associated methods for reproducing a copy protected far field synthetic audio representation of an audio scene. Additional embodiments relate to a computer program for performing these methods.

In far field synthetic reproduction systems, raw data, that is, audio files that are typically present as metadata as well as audio files, are stored and transmitted, respectively, and are used to represent the actual speakers and actual speaker configurations , An array with more than 30 loudspeakers scattered in space), respectively. To this end, the metadata typically includes location information for the enclosed audio objects. During rendering, audio files are distributed to a plurality of speaker channels for the purpose of virtually positioning individual audio objects in the play room, depending on the position information, and the speaker configuration present. As a result, audio files normally assigned to audio objects are output through all speaker channels, but are output with different scaling (i.e., with different loudness) and with different delays.

In some situations, the hardware of the playback room must be minimized, which allows only players with a speaker array to be installed in the playback room, without any renderer (referred to below as a far field synthesis processor). In such an approach, the far field composite audio representation of the audio scene must be pre-rendered for the correct speaker configuration and the correctly pre-rendered far field composite audio representation should be considered to be reproduced in the correct reproduction room, E., A room with an erroneous speaker array), typically results in a significant reduction in audio quality. For example, based on this concept, in a movie theater having different room sets and different speaker setups, erroneous actions due to subsequent quality losses can not be ruled out.

In particular, additional requests are made by rights management in the context of pre-rendered content so that the reproduction of specific content in the play room must be taken only if licenses are available. Several approaches exist to address this problem in the prior art.

One solution is to separate the use of encryption and storage of keys, for example, in a dongle (typically: a portable memory medium), for example, especially for license issues. Here, it is preferable that the dongle is designed so as to be difficult enough to copy the same thing. With this procedure, it can be ensured that playback is enabled only by that dongle. The disadvantage of this method is that if the dongle is lost, the entire licensed content can no longer be played back. Additionally, the data rate to be encrypted is relatively high, which is against the goal of reducing hardware to only the most essential.

As an alternative to encrypting the audio file, so-called audio watermarking (referred to below as an audio watermark) may be used. Here, the signal masked by the useful signal, i.e., the non-audible signal, is recognized in the audio signal. For example, to prevent audible interference by watermarks, watermarks can be recognized only on individual channels. On the playback side, the watermark detector can extract the watermark and refuse to play if the license does not match the identification number of the available playback system with the watermark. This watermarking technique is also compatible with pre-rendering techniques so that the association of a pre-rendered far field composite audio representation with a particular playback room can be predetermined based on the watermark.

The basic problem of copy protection by audio watermarking is that it can be intentionally destroyed by trial and error method. The background is that the "attacker" has access to the watermark and can change the signal until the watermark is no longer detectable. In particular, in the above-mentioned approach, in which the watermark is recognized only in a single channel, such as the speaker channel of a pre-rendered far field composite audio representation, the problem of the targeted attack being made more easily by comparing the correlation of two adjacent channels Lt; / RTI > Thus, there is a need for an improved approach.

It is an object of the present invention to provide an apparatus and method for improving copy protection for far field composite audio representations and in particular for pre-rendered far field composite audio representations.

The problem is solved by the points of the independent clauses.

The first embodiment provides an apparatus for generating a copy-protected far field composite audio representation of an audio scene having a plurality of audio objects, each audio object including an audio file and location information. The apparatus includes a watermark embedder for embedding a watermark in at least one audio file of a plurality of audio objects to generate a modified audio file for at least one audio object, Specify. Additionally, the apparatus includes a far field synthesis processor for generating a copy protected, far field synthesized audio representation of the audio scene by using the speaker configuration of the particular playback room of the modified audio file and the location for the at least one audio object .

A second aspect of the present invention relates to an assigned method comprising embedding a watermark and generating a copy protected far field synthetic audio representation.

Thus, these first two aspects of the present invention are based on the knowledge that the watermark is inserted into the pre-rendered far field composite audio representation to specify the playback room in which the far field composite audio representation is calculated. According to the present invention, a watermark is inserted into un-rendered audio files (raw data), i.e., audio tracks provided prior to rendering so that the watermark is linked to at least one audio object (not a specific speaker channel). Recognizing the watermark in the raw data enables the watermark to be distributed across all speaker channels and at least a group of speaker channels after rendering. In particular, compared to the prior art, this has the advantage that the watermark can not be easily removed again from the pre-rendered far-field composite audio representation. This is also supported by the fact that the watermark changes with time along with its "carrier object" according to the position information for each object.

According to a further embodiment, a watermark is embedded in an audio file of an audio object using pre-masking, post-masking, simultaneous masking and / or noise masking so that, at least from a psychoacoustic point of view, to be.

According to one embodiment, the watermark may be embedded in an audio file of an audio object having certain characteristics, such as the largest audio object. Inserting a watermark into the largest audio object offers the benefit of maximizing psychoacoustic masking.

Additional embodiments provide an apparatus for reproducing a copy-protected far field synthetic audio representation of an audio scene in a particular reproduction room (according to the third aspect) A watermark detector for detecting a watermark that specifies a particular playback room in at least one speaker channel of the watermark detector, and a watermark detector for detecting only a watermark that specifies a particular playback room, For example.

According to a fourth aspect of the present invention there is provided a method for reproducing a copy-protected far field composite audio representation of an audio scene, comprising the steps of detecting a watermark and reproducing a copy protected wave composition audio representation .

According to one embodiment, the watermark to be detected (i.e., the watermark of each room) may be stored in a watermark detector, or read from the data carrier, for example via an interface.

According to a further embodiment, the watermark detector comprises a frequency spreader and a correlator that is operative to determine a correlation between the watermark to be detected and the signal of the at least one speaker channel that is transformed into a spectral form using a frequency spreader.

According to the fifth and sixth aspects of the present invention, there is provided a computer program that enables the steps or sub-steps of the above-described methods to be performed.

Embodiments of the present invention will be discussed below based on the accompanying drawings.
1A is a schematic block diagram of an apparatus for generating a copy protected far field synthetic audio representation in accordance with the first embodiment.
1B is a schematic flow diagram of a method for generating a copy protected far field synthetic audio representation in accordance with a further embodiment.
2A is a schematic block diagram of an apparatus for reproducing a copy protected far field synthetic audio representation according to a second embodiment.
2B is a schematic flow diagram of a method for reproducing a copy protected far field synthetic audio representation in accordance with a further embodiment.
3 is a schematic block diagram of a far field synthesis processor for illustrating steps during far field synthesis rendering.
4 is a schematic block diagram of a watermark in-organs for explaining an operation mode when a watermark is embedded in an audio file.

BRIEF DESCRIPTION OF THE DRAWINGS Embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which like elements and elements having the same functions are provided with the same reference numerals, Or mutually applicable.

Prior to discussing embodiments of the present invention in detail with reference to Figs. 1A, 1B, 2A and 2B, a farfield synthesis processor based on Fig. 3 and a watermark embedder based on Fig. 4 will be described.

3 shows a far field synthesis processor 10 with a schematic speaker array 20.

The speaker array 20 typically includes a plurality of individual speakers controlled via speaker channels LS1-LSn. For example, a speaker array having 40 or 60 loudspeakers may be implemented as a 360 degree array, for example, arranged in a particular reproduction room 22. [ For example, the room 22 can be a movie theater, and the speakers of the speaker array 20 are grouped around the viewer 24 or arranged in an array. Thus, the speakers are arranged, for example, behind the screen, behind the viewer, as well as on the left and right sides of the listener side.

Also at point P the listener is surrounded by a plurality of speakers of the speaker array 20 so that the audio objects can be virtually positioned in space and the speaker array 20 using the speaker channels LS1 and LSn, (E. G., By one-way control of a subset of the speakers of the speaker array 20), respectively, by control of each of them. These virtual positioning and virtual movements of an audio object are each determined by the exact knowledge of the speaker configuration, such as the speaker (s), such that the individual speaker channels (LS1-LSn) can only be determined for a particular speaker array (20) (See array 20). The determination and calculation are performed by the far field synthesis processor 10, respectively, as described below.

The far field synthesis processor 10 uses the information I20 (number and position) of the speaker configuration 20 of the specific reproduction room 22 to generate an audio file and positional information (in the Cartesian coordinate system (LS1-LSn) based on a plurality of audio objects (AO1-AOn), each including a plurality of audio objects (AO1-AOn).

To this end, the far field synthesis processor includes a plurality of inputs (see AD1-ADn) that allow a plurality of audio signals to be supplied to different audio objects. In this way, the input (see AD1) receives, for example, the audio file 1 for the first audio object and the assigned location information. For example, in a cinema setting, the audio object 1 may be the voice of an actor moving, for example, from left to right of the screen, or possibly further away from the viewer and moving towards the viewer. Next, the audio file 1 will be the actual voice of this actor, while the positional information is a function of time representing the current position of the first actor in the recording settings at a particular time. On the other hand, the audio file n may be the voice of an additional actor, for example moving in the same way as the first actor or in a different way. The current position of the other actor is provided to the far field synthesis processor 10 by position information synchronized with the audio signal n. Actually, there are different virtual audio objects according to the recording settings, and the audio files of each audio object are supplied to the far field composition processor 10 as individual tracks.

As described above, the far field synthesis processor outputs a plurality of speaker channels LS1-LSn in a directly reproducible analog form, but preferably in digital form, And can be directly reproduced through the speakers. The far field synthesis processor 10 receives the positions of the individual loudspeakers as input information I20 in a reproduction setting (see the listening room 22 and the speaker array 20, respectively) such as a movie theater.

In addition, more information such as room sound can be read through this information input I20.

Generally speaking, for example, the speaker signal assigned to the speaker channel LS1 will be a superposition of the component signals of the virtual audio objects so that the speaker signal for the speaker LS1 is the first Component, an n-th component based on the audio object (n) as well as a second component based on the audio object (2). The individual component signals are linearly superimposed, i.e. added, after their computation to reproduce a linear superposition in the listener's ear that listens to the linear superposition of the sound source that the listener can perceive in the actual setting. Due to this overlapping, the first, second and n-th audio objects are included in the respective speaker channels LS1-LSn, the audio files are scaled by different scaling factors and / or the speaker channels LS1 and LSn And is delayed with different delay factors. Here, it should be noted that the scaling of the individual speaker channels (LS1-LSn) can also be performed to zero so that the audio object in the speaker channel is no longer audible.

Fig. 4 shows an organ in watermark 30 for embedding a watermark WS in an audio file AD to generate a modulated audio file AD '.

The watermarked organs 30 read both the audio file AD and the watermark (WS) to be embedded, for example, as a PCM signal or as a bit stream of temporally discrete audio samples. These two read digital signals AD and WS are now converted to a spectral form, e.g., audio spectral values AD _S and watermark spectral values WS _S , using, for example, a frequency spreader See the stage 30a). Conversion of WS to WS _S can be performed, for example, by multiplying the data signal WS by a noise signal (white noise) or a pseudo noise signal. Converting AD to AD _S can be directly converted, for example, with the aid of a fast Fourier transform. Starting from the audio file AD and the spectral form AD _S of the audio file, it is of course possible to start with a region for masking (for example regions with high overall energy and temporal masking thresholds of the audio signal, respectively) It is possible to determine the psychoacoustic model to display. The masking thresholds indicate how the audio signal is changed so that the change can be independent of the resulting auditory perception.

Different mechanisms are available, such as temporal masking (post-masking, pre-masking or synchronous masking) as well as noise masking (signal masking by signal or signal masking by noise). If s that can be used to insert the data signal of a masked form in the AD such masking threshold of the AD _S and masking regions are known, respectively, a combination of AD _S and WS _S is carried out in the second stage (reference numeral (30b ) Reference). Specifically, in the step of combining, the overlapping with the weighted version of the audio signal _(S AD) is a data signal (WS _S), for weighting the determined masking threshold value and the determined masking regions are considered, respectively. The result of this superposition is the modified audio signals (AD 'and WS _S ') (in spectral variations). By this procedure, when the audio file AD 'is reproduced, the audio file AD is reproduced without any change of the audible audio reproduction to the human being, until the audio file AD becomes the carrier for the data signal such as the watermark WS. It is possible to modify the file AD.

FIG. 1A illustrates an apparatus 100 for generating a copy protected, far field composite audio representation of an audio scene. The apparatus 100 includes inputs for a plurality of audio objects (see AD1 + PO1 and ADn + POn, respectively) and outputs for a plurality of speaker channels LS1-LSn. Additionally, the apparatus 100 includes a watermarked organs 102 and farfield synthesis processor 104. The organ 102 within the watermark is arranged on the input side, i.e., on the inputs side for audio objects AD1 + PO1 and ADn + POn. The far field synthesis processor 104 is provided on the output side, i.e., on the side of outputs to the speaker channels LS1-LSn. Subsequently, the operating mode of the device 100 will be described with reference to FIG. 1B showing the assigned method.

The far field composite audio representation of the audio scenes is based on at least a plurality of audio objects (see AD1 + PO1 and ADn + POn, respectively). Thus, as already exemplified above, each audio object includes the audio file AD1 or Adn as well as the assigned location information PO1 or POn.

In step 1, the device 100 (see step 120 of FIG. 1B) embeds a watermark WS, which contains at least one audio file, i.e., AD1 or Adn, Can be used as a digital signal for the organs 102 in the mark. The watermark specifies a particular play room in which the far field composite audio representation is rendered. Here, the watermark may include a playback room, a player in the playback room, or generally an ID of a key assigned to the room, or an individual unique ID. Embedding can be performed according to the process described above. The result of the built-in is at least the modified audio file AD1 'or ADn' (here AD1 ').

Accordingly, the watermark in-progress 102 outputs the modified audio file AD1 'together with the position information PO1 and further forwards the unmodified audio file ADn together with the position information POn. If the watermark in-organ 102 embeds a watermark in some audio files AD1 and ADn, according to further embodiments, some modified audio files AD1 'and AD2' together with the position information PO1 and POn, And Adn ') are output. Alternatively, the location information may be fed directly to the farfield composition processor 104, rather than being delivered by the organ 102 within the watermark.

According to additional embodiments, the watermarked organs 102 may embed watermarks in only one audio file with specific characteristics. The property may be, for example, the relative volume of the audio object to other audio objects or the relative motion of the audio object to other objects. In addition, the watermarked organs 102 can be configured to examine a plurality of audio objects with respect to the detected characteristic, and to select a watermark for embedding the watermark.

Even if the organ 102 in the watermark is described as including the function of the organ in the watermark described in Fig. 4, the organ 102 in the watermark can also be configured differently, Mechanisms can be used.

The far field synthesis processor 104 may be configured to start from a plurality of audio objects ADn + POn to output audio objects in a scaled, delayed, and summed form using individual speaker channels LS1-LSn , A second field of device 100 for calculating the far field composite audio representation, i. E., The scaling of individual audio objects (AD1 '+ PO1 and ADn + POn), for each playback room (see step 140 of FIG. Functional object, and at least one audio object includes a modified audio file AD1 '. To this end, the far field synthesis processor also receives information about the speaker configuration I20 in addition to the audio files AD1 '/ ADn and the location information PO1 / POn of the audio objects. The calculation is basically carried out as described above. Thus, the audio representation of the audio scene may be output as a plurality of speaker channels (LS1-LSn) and stored on a memory medium such as a hard drive or Blu-ray, and the plurality of speaker channels (LS1-LSn) Is preferably stored.

As a result, the watermark (audio watermark) is distributed (statically and temporally) over all or at least some of the speaker channels LS1-LSn and has the same acoustic position as the individual audio objects. Thus, from a psychoacoustical point of view, this is optimally non-audible because the same direction also means the same maximum masking. In addition, for example, by comparison of individual speaker channels, it can be ensured that the watermark can not be easily detected and removed. The background for this is that the watermark is distributed over all or at least most of the speaker channels, but is distributed with different scaling and delays so that no correlation between the channels that allows conclusions for the watermark can be detected.

FIG. 2A illustrates an apparatus 200 for reproducing a copy protected, far field composite audio representation of an audio scene. Apparatus 200 includes a watermark detector 202 and a player 204. Apparatus 200 includes a data interface for speaker channels LS1-LSn that can be accessed by both watermark detector 202 and player 204. [ Player 204 is on the one hand communicatively coupled to the watermark detector 202 via an amplifier for a plurality of speaker channels, which is informally connected to the watermark detector 202 and, on the other hand, directly or in this case LS1 * -LSn * And is coupled to the array 20. Next, the mode of operation of the device 200 will be discussed with the assigned method on which the device 200 is based (see FIG. 2B).

For example, a far field composite audio representation, which may be stored in a mobile data carrier, is read into the device 200 in the form of already rendered speaker channels LS1-LSn, and individual speaker channels LS1- Is available for both components 202 and 204 of device 200. [

In the first step (see step 220 of FIG. 2B), detection of the watermark SWS to be detected, which is stored in the watermark detector 202 or can be read from the outside, is performed. Reading the watermark SWS to be detected may be performed, for example, using a dongle or using an external storage medium that is generally connected to the device 200. The watermark SWS to be detected corresponds to the watermark WS discussed or described with reference to Fig. To detect the watermark SWS to be detected, the watermark to be detected is typically pre-rendered, and the rendering is basically performed in a manner similar to the insertion. Thus, the watermark is transformed in a spectral form, i. E. Using a noise generator (frequency spreader). This spectral version of the watermark SWS to be detected can then be compared to the speaker channels LS1-LSn using a correlator. Preferably, the watermark detector 202 is configured to detect a watermark SWS to be detected in a plurality of speaker channels LS1-LSn.

According to a further embodiment, for example, when a watermark is assigned to the largest audio object, the watermark can only be detected in the largest speaker channel, since typically the largest speaker channel also has the largest object . It should be noted here that this is not necessarily the case, especially if some spatially adjacent audio objects are individually larger than the largest object.

Thus, if the watermark is determined in some speaker channels in a speaker channel or preferably using correlation, an enable signal may be sent to the player 204, and then the enable signal may be a far field composite audio representation .

As a result, the player 204 reproduces the audio representation (see step 240 of FIG. 2B), and the actual reproduction is basically in the form of amplified, for example, as the speaker signals LS1 * -LSn * Expresses only the transmission of the speaker signals LS1-LSn to the speaker array 20.

According to a further embodiment, active playback prevention by the player 204 based on the watermark detector 202 will be possible. This has the advantage that destroying the watermark on the speaker channels LSl-LSn will still not yield success against the playback of the speaker channels LSl-LSn and the far field composite audio representation, respectively .

In general, the concept described above provides the advantage that no separate renderer is required on the player side and therefore the computing power can be kept low. With this reduced computing power, the pre-rendered content protected by the audio watermark can also be played back by lower performance platforms such as embedded boards or DSPs associated with the data memory. These players can then be used as mobile systems, such as, for example, switch boxes, wall boxes, external devices or separate devices.

While some aspects have been described in the context of an apparatus, it is evident that these aspects also represent a description of a corresponding method, such that a block or device of the apparatus also corresponds to a characteristic of each method step or method step. Similarly, aspects described in the context of a method also represent descriptions of blocks or details or features of corresponding devices. Some or all of the method steps may be performed by (or using) a hardware device such as, for example, a microprocessor, programmable computer or electronic circuitry. In some embodiments, some or some of the most important method steps may be performed by such an apparatus.

A creatively encoded signal, such as an audio signal or a video signal or a transport stream signal, may be stored on a digital memory medium or transmitted over a transmission medium, such as a wired transmission medium or wireless transmission medium, have.

The inventive encoded audio signal may be stored on a digital memory medium or transmitted over a wired transmission medium or a wireless transmission medium, e.g., a transmission medium such as the Internet.

Depending on the specific implementation requirements, embodiments of the present invention may be implemented in hardware or software. The implementation may be implemented in a digital storage medium, e. G. A floppy disk, a DVD, a Blu-ray Disc, a CD, a ROM , PROM, EPROM, EEPROM or FLASH memory, hard drive or other magnetic or optical memory. Thus, the digital storage medium may be computer readable.

Some embodiments in accordance with the present invention include a data carrier that includes electronically readable control signals that can cooperate with a programmable computer system to perform one of the methods described herein.

In general, embodiments of the present invention may be implemented as a computer program product having program code, and the program code is operable to perform one of the methods when the computer program product is run on a computer.

The program code may be stored, for example, on a machine-readable carrier.

Other embodiments include a computer program for performing one of the methods described herein, wherein the computer program is stored on a machine-readable carrier.

Thus, in other words, one embodiment of the inventive method is a computer program comprising program code for performing one of the methods described herein when the computer program is run on a computer.

Accordingly, additional embodiments of the inventive methods are data carriers (e.g., digital storage media or computer readable media) in which computer programs for carrying out one of the methods described herein are included and recorded.

Thus, a further embodiment of the inventive method is a sequence or data stream of signals representing a computer program for performing one of the methods described herein. For example, a sequence of signals or a data stream may be configured to be transmitted over a data communication connection, for example, over the Internet.

Additional embodiments include processing means, e.g., a computer or programmable logic device, configured or adapted to perform one of the methods described herein.

Additional embodiments include a computer in which a computer program for performing one of the methods described herein is installed.

Additional embodiments in accordance with the present invention include an apparatus or system configured to transmit a computer program to a receiver for performing one of the methods defined herein. The transmission can be performed electronically or optically. The receiver may be, for example, a computer, a mobile device, a memory device, or the like. A device or system may include, for example, a file server for transmitting a computer program to a receiver.

In some embodiments, a programmable logic device (e.g., a field programmable gate array, FPGA) may be used to perform some or all of the functions of the methods described herein. In some embodiments, the field programmable gate array may cooperate with the microprocessor to perform one of the methods defined herein. In general, the methods are preferably performed by any hardware device. The hardware device may be general purpose applicable hardware such as a computer processor (CPU) or method specific hardware such as, for example, an ASIC.

The embodiments described above are merely illustrative of the principles of the present invention. It is understood that variations and modifications of the arrangements and details described herein will be apparent to those skilled in the art. Accordingly, the invention is limited only by the scope of the appended claims, and is not intended to be limited by the specific details presented in the manner of description and explanation of the embodiments herein.

Claims (16)

An apparatus (100) for generating a copy protected, far field synthetic audio representation of an audio scene having a plurality of audio objects,
Each audio object includes audio files AD1, AD2, ADn and position information PS1, PS2, PSn,
(WS) for embedding a watermark (WS) in at least one of the audio files (AD1, AD2, ADn) of the plurality of audio objects to generate a modified audio file (AD1 ') for at least one audio object In-mark organ 102 - The watermark WS specifies the particular reproduction room 22 in which the far field composite audio representation is rendered in accordance with the speaker configuration I20 present in the particular reproduction room 22 -; And
By using the speaker configuration (I20) of the specific reproduction room (22), the modified audio file (AD1 ') and the position information (PS1, PS2, PSn) for the at least one audio object, And a far field synthesis processor (104) for generating the copy protected far field composite audio representation.
An apparatus (100) for generating a copy protected far field synthetic audio representation. The method according to claim 1,
The watermark inner organ 102 is configured to embed the watermark WS containing predetermined properties in the audio files AD1, AD2, ADn of the audio objects in the plurality of audio objects.
An apparatus (100) for generating a copy protected far field synthetic audio representation. 3. The method of claim 2,
Wherein the predetermined property comprises a relative loudness of an audio object of the plurality of audio objects to other audio objects and / or the predetermined characteristic comprises audio of the plurality of audio objects < RTI ID = 0.0 > Including the relative motion of the object,
An apparatus (100) for generating a copy protected far field synthetic audio representation. 4. The method according to any one of claims 1 to 3,
The far field synthesis processor 104 is configured to calculate a plurality of speaker channels LS1, LS2, LSn to generate the copy protected far field composite audio representation of the audio scene, The channels LS1, LS2 and LSn may be arranged in such a way that the plurality of audio files of the audio objects scaled by different scaling factors and / or delayed by different delay factors, according to the position information PS1, PS2, AD1, AD2, ADn)
An apparatus (100) for generating a copy protected far field synthetic audio representation. 5. The method of claim 4,
At least two of said plurality of speaker channels (LS1, LS2, LSn) comprise said one modified audio file (AD1 ') for said at least one audio object at different scales and / or different delays doing,
An apparatus (100) for generating a copy protected far field synthetic audio representation. The method according to claim 4 or 5,
Wherein the plurality of speaker channels (LS1, LS2, LSn) comprise at least 40 channels,
An apparatus (100) for generating a copy protected far field synthetic audio representation. 7. The method according to any one of claims 1 to 6,
The watermark within the organ (102) is configured to incorporated in the frequency spectrum _(S AD) of the audio file (AD1, AD2, ADn), the watermark (WS),
An apparatus (100) for generating a copy protected far field synthetic audio representation. 8. The method according to any one of claims 1 to 7,
The watermark inside organs 102 are arranged in such a way that the watermark WS is masked using post-masking, pre-masking, simultaneous masking and / or noise masking, , AD2, ADn)
An apparatus (100) for generating a copy protected far field synthetic audio representation. CLAIMS 1. A method for generating a copy protected, far field composite audio representation of an audio scene having a plurality of audio objects,
Each audio object includes audio files AD1, AD2, ADn and position information PS1, PS2, PSn,
Embedding a watermark (WS) in at least one of said audio files (AD1, AD2, ADn) of said plurality of audio objects to generate a modified audio file (AD1 ') for at least one audio object 120) - said watermark (WS) specifying said specific reproduction room (22) in which said far field composite audio representation is rendered in accordance with a speaker configuration (I20) present in a particular reproduction room (22); And
By using the speaker configuration (I20) of the specific reproduction room (22), the modified audio file (AD1 ') and the position information (PS1, PS2, PSn) for the at least one audio object, And generating (140) the copy protected far field composite audio representation.
A method for generating a copy protected far field synthetic audio representation. An apparatus (200) for playing a copy-protected far field synthesized audio representation of an audio scene in a specific playback room (22)
For detecting a watermark (WS) identifying the particular reproduction room (22) in at least one speaker channel (LS1, LS2, LSn) of the copy-protected far field composite audio representation of the audio scene 202); And
Wherein the watermark detector (202) determines the watermark (WS) that identifies the particular reproduction room (22) in which the far field composite audio representation is rendered in accordance with a speaker configuration (I20) present in the particular reproduction room (22) (204) for playing back the copy protected far field composite audio representation only when it is detected,
A device (200) for reproducing a copy protected far field synthetic audio representation. 11. The method of claim 10,
The player 204 is configured to determine whether the watermark (WS) that matches the watermark (SWS) to be detected is not detected by the watermark detector (202)
A device (200) for reproducing a copy protected far field synthetic audio representation. The method according to claim 10 or 11,
The watermark SWS to be detected is stored in the watermark detector 202 or the device includes an interface that allows a portable data carrier stored with the watermark SWS to be detected to be connected,
A device (200) for reproducing a copy protected far field synthetic audio representation. 13. The method according to any one of claims 10 to 12,
The watermark detector (202) comprises a frequency spreader, and a demultiplexer for demultiplexing the signal between the watermark (SWS) to be detected and the signal of the at least one speaker channel (LS1, LS2, LSn) A correlator configured to determine a correlation,
A device (200) for reproducing a copy protected far field synthetic audio representation. 13. The method according to any one of claims 10 to 12,
The player (204) is connected to a speaker array (20) of the particular reproduction room (22) comprising a plurality of speakers, each speaker comprising a separate speaker channel (LS1, LS2, LSn)
A device (200) for reproducing a copy protected far field synthetic audio representation. A method for reproducing a copy-protected far field composite audio representation of an audio scene in a specific playback room (22)
The far field composite audio representation is rendered according to a speaker configuration (I20) present in a particular reproduction room (22) at least one speaker channel (LS1, LS2, LSn) of the copy protected wave field synthetic audio representation of the audio scene (220) detecting a watermark (WS) specifying the specific reproduction room (22); And
(240) only when the watermark (WS) identifying the particular reproduction room (22) is detected.
A method for reproducing a copy protected far field synthetic audio representation. 15. A computer program having program code for performing the method according to claim 9 or 15 when executed on a computer.

Images